দেশ: মার্কিন যুক্তরাষ্ট্র
ভাষা: ইংরেজি
সূত্র: NLM (National Library of Medicine)
ALLOPURINOL (UNII: 63CZ7GJN5I) (ALLOPURINOL - UNII:63CZ7GJN5I)
Major Pharmaceuticals
ALLOPURINOL
ALLOPURINOL 100 mg
PRESCRIPTION DRUG
Abbreviated New Drug Application
ALLOPURINOL- ALLOPURINOL TABLET MAJOR PHARMACEUTICALS ---------- ALLOPURINOL TABLETS USP RX ONLY DESCRIPTION Allopurinol has the following structural formula: Allopurinol is known chemically as 1,5-dihydro-4_H_-pyrazolo [3,4-_d_]pyrimidin-4-one. It is a xanthine oxidase inhibitor which is administered orally. Inactive Ingredients: corn starch, croscarmellose sodium, lactose, magnesium stearate, povidone. Allopurinol 300 mg also contains FD&C yellow #6 lake. Its solubility in water at 37°C is 80.0 mg/dL and is greater in an alkaline solution. CLINICAL PHARMACOLOGY Allopurinol acts on purine catabolism, without disrupting the biosynthesis of purines. It reduces the production of uric acid by inhibiting the biochemical reactions immediately preceding its formation. Allopurinol is a structural analogue of the natural purine base, hypoxanthine. It is an inhibitor of xanthine oxidase, the enzyme responsible for the conversion of hypoxanthine to xanthine and of xanthine to uric acid, the end product of purine metabolism in man. Allopurinol is metabolized to the corresponding xanthine analogue, oxipurinol (alloxanthine), which also is an inhibitor of xanthine oxidase. It has been shown that reutilization of both hypoxanthine and xanthine for nucleotide and nucleic acid synthesis is markedly enhanced when their oxidations are inhibited by allopurinol and oxipurinol. This reutilization does not disrupt normal nucleic acid anabolism, however, because feedback inhibition is an integral part of purine biosynthesis. As a result of xanthine oxidase inhibition, the serum concentration of hypoxanthine plus xanthine in patients receiving allopurinol for treatment of hyperuricemia is usually in the range of 0.3 to 0.4 mg/dL compared to a normal level of approximately 0.15 mg/dL. A maximum of 0.9 mg/dL of these oxypurines has been reported when the serum urate was lowered to less than 2 mg/dL by high doses of allopurinol. These values are far below the saturation levels at which point their precipitation would be expected to occur সম্পূর্ণ নথি পড়ুন